1998129259 has 8 divisors (see below), whose sum is σ = 2285185760. Its totient is φ = 1711475136.

The previous prime is 1998129247. The next prime is 1998129269. The reversal of 1998129259 is 9529218991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998129259 - 2¹¹ = 1998127211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998129229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89874 + ... + 109879.

It is an arithmetic number, because the mean of its divisors is an integer number (285648220).

Almost surely, 2^1998129259 is an apocalyptic number.

1998129259 is a deficient number, since it is larger than the sum of its proper divisors (287056501).

1998129259 is a wasteful number, since it uses less digits than its factorization.

1998129259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201189.

The product of its digits is 1049760, while the sum is 55.

The square root of 1998129259 is about 44700.4391365454. The cubic root of 1998129259 is about 1259.5280963562.

The spelling of 1998129259 in words is "one billion, nine hundred ninety-eight million, one hundred twenty-nine thousand, two hundred fifty-nine".